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CVE-2026-23869GHSA-479C-33WC-G2PG

A denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel, react-server

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 19.0.5, 19.1.6, 19.2.5
3 proofs of concept on GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

A denial of service vulnerability exists in React Server Components, affecting the following packages: react-server-dom-parcel, react-server-dom-turbopack and react-server-dom-webpack (versions 19.0.0 through 19.0.4, 19.1.0 through 19.1.5, and 19.2.0 through 19.2.4). The vulnerability is triggered by sending specially crafted HTTP requests to Server Function endpoints.The payload of the HTTP request causes excessive CPU usage for up to a minute ending in a thrown error that is catchable.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: partial

  3. Record last updated

Affected versions

  • Meta react-server-dom-turbopack

    From 19.0.0 · through 19.0.4; From 19.1.0 · through 19.1.5; From 19.2.0 · through 19.2.4

  • Meta react-server-dom-parcel

    From 19.0.0 · through 19.0.4; From 19.1.0 · through 19.1.5; From 19.2.0 · through 19.2.4

  • Meta react-server-dom-webpack

    From 19.0.0 · through 19.0.4; From 19.1.0 · through 19.1.5; From 19.2.0 · through 19.2.4

  • react-server-dom-parcelnpm

    From 19.0.0 · fixed in 19.0.5

  • react-server-dom-parcelnpm

    From 19.1.0 · fixed in 19.1.6

  • react-server-dom-parcelnpm

    From 19.2.0 · fixed in 19.2.5

  • react-server-dom-turbopacknpm

    From 19.0.0 · fixed in 19.0.5

  • react-server-dom-turbopacknpm

    From 19.1.0 · fixed in 19.1.6

  • react-server-dom-turbopacknpm

    From 19.2.0 · fixed in 19.2.5

  • react-server-dom-webpacknpm

    From 19.0.0 · fixed in 19.0.5

  • react-server-dom-webpacknpm

    From 19.1.0 · fixed in 19.1.6

  • react-server-dom-webpacknpm

    From 19.2.0 · fixed in 19.2.5

References 4

GitHub · facebook/react

GitHub · cybertechajju/CVE-2026-23869-Exploit

GitHub · shaheryar773/mitigate-cve-2026-23869-react-server-component-loops

GitHub · yohannslm/CVE-2026-23869